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InputStream to String; String to InputStream

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import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;

public class Convert
{
    /**
     * Convert an InputStream to a String.
     *
     * @param str the InputStream to be transformed
     * @return the String format of the InputStream
     */
    public static String inputStreamToString(InputStream str)
    {
        BufferedReader reader = new BufferedReader(new InputStreamReader(str));
        StringBuilder sb =  new StringBuilder();
        try {
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
        } catch (java.io.IOException e) {
            e.printStackTrace();
        } finally {
            try {
                str.close();

            } catch (java.io.IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }

    /**
     * Convert a String to an InputStream.
     *
     * @param str
     * @return
     */
    public static InputStream stringToInputStream(String str)
    {
        InputStream is = null;
        try
        {
            is = new ByteArrayInputStream(str.getBytes("UTF-8"));
        } catch (UnsupportedEncodingException ex)
        {
            System.err.println("Error while converting String to InputStream: "
                + ex.getMessage());
        }

        return is;
    }

} // class Convert